Spoilers
During the last episode, Eun Seom (Song Joong Ki) was thrown over a waterfall as a test by the Ago Tribe. The chief of the Momo Tribe (Karata Erika) saved him from drowning.
Will Ta Gon succeed in being king of Arth?Ta Gon (Jang Dong-Gun) had faced difficulty to maintain his image of a kind leader. His deep secret was found out by Asa Ron (Lee Do Kyung) and the other tribe leaders. He killed them all in order to hide the truth that he is an Igutu (half-Neanthal, half-human).
Mungtae of the Wahan Tribe (Park Jin) also found out about his secret. Ta Gon asked him to murder anyone who opposes him. Mihol (Jo Sung Ha) told Ta Gon that he has the King's eyes. Arth is ruled by a group of tribal leaders who are thirsty for power and deciding for Arth's greater good.
Ta Gon wanted to be the first king of Arth because no one can stop him from wanting absolute power. He is now going after Hae Tribe and their secret to making bronze. Will he be able to persuade Taealha (Kim Ok Bin), to reveal all her tribe's secrets?
2. Will Eun Seom win over the Ago Tribe?Ipsaeng (Kim Sung Cheol) convinced him to make it look that he was possessed by the god of the Ago Tribe, Inaishingi. That is the reason why he was sent over the waterfalls. Eun Seom needs to defeat Ago Tribe before he can get more power.
He made it from the deadly challenge of Momo Tribe. Will Ago Tribe acknowledge him as a god? Can he make all the clans reunited and defeat Ta Gon?
3. Will Saya learn about his long-lost twin?
Eun Seom and Saya (also Song Joong Ki) are twins who were separated as babies in the first episode. They are the sons of Asa Hon (Chu Ja Hyun) and Ragaz (Yoo Tae Oh) who are half-Neanthal and half-human. Ta Gon adopted Saya and kept him locked in a tower. He wanted his father to be the most powerful ruler in Arth. He is also violent and cruel like Ta Gon.
Eun Seom and Saya have the same dreams but they do not know about each other. Tanya (Kim Ji Won) promised to the Wahan Tribe that she will keep Saya's resemblance to Eun Seom. During the last week's episode, Saya heard her talking about it and suspected that she is hiding something from him.
4. Will Tanya be able to wield her own power?
During the last week's episode, Tanya decided to return to lark because she can't take Ta Gon's violence. She discovered that other members of Wahan Tribe were not interested to return to lark because they were fine living in Arthdal.
Ta Gon and Taealha forced Tanya for a speech. Tanya manipulated the script so the people will think she is a merciful priestess. Ta Gon said that the balance is good between them. Tanya is now determined to gain more power by winning the trust of her people.
